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dc.contributor.author
Ilg, Patrick
dc.contributor.author
Kröger, Martin
dc.date.accessioned
2020-10-15T11:33:20Z
dc.date.available
2020-10-15T09:37:24Z
dc.date.available
2020-10-15T11:33:20Z
dc.date.issued
2020-10-21
dc.identifier.issn
1463-9084
dc.identifier.issn
1463-9076
dc.identifier.other
10.1039/d0cp04377j
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/446114
dc.identifier.doi
10.3929/ethz-b-000446114
dc.description.abstract
The intriguing properties of magnetic nanoparticles have sparked a growing number of theoretical studies as well as practical applications. Here, we provide the first comprehensive study of the influence of interactions on the two main relaxation mechanisms: internal (Néel) and Brownian relaxation. While non-interacting magnetic nanoparticles show Debye behavior with an effective relaxation time, many authors use this model also for the interacting case. Since Néel relaxation is typically a thermally activated process on times scales that are many orders of magnitude larger than the underlying micromagnetic times, we use extensive computer simulations employing a Brownian dynamics/Monte-Carlo algorithm to show that dipolar interactions lead to significant deviations from the Debye behavior. We find that Néel and Brownian relaxation can be considered as independent processes for short enough times until dipolar interactions lead to a coupling of these mechanisms, making the interpretation more difficult. We provide mean-field arguments that describe these short and long-time, effective relaxation times well for weak up to moderate interaction strengths. Our findings about the coupling of Brownian and Néel process and the effective relaxation time provide an important theoretical insight that will have also important consequences for the interpretation of magnetic susceptibility measurements and magnetorelaxometry analysis.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Royal Society of Chemistry
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc/3.0/
dc.title
Dynamics of interacting magnetic nanoparticles: effective behavior from competition between Brownian and Néel relaxation
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial 3.0 Unported
dc.date.published
2020-09-11
ethz.journal.title
Physical Chemistry Chemical Physics
ethz.journal.volume
22
en_US
ethz.journal.issue
39
en_US
ethz.journal.abbreviated
Phys. Chem. Chem. Phys.
ethz.pages.start
22244
en_US
ethz.pages.end
22259
en_US
ethz.size
16 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
VISIONNANO - Viscoelastic properties, entanglements, and polymer dynamics in ionic nanocomposites
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Cambridge
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02160 - Dep. Materialwissenschaft / Dep. of Materials::02646 - Institut für Polymere / Institute of Polymers::03359 - Oettinger, Christian / Oettinger, Christian
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02160 - Dep. Materialwissenschaft / Dep. of Materials::02646 - Institut für Polymere / Institute of Polymers::03359 - Oettinger, Christian / Oettinger, Christian
en_US
ethz.grant.agreementno
185052
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projektförderung in Mathematik, Natur- und Ingenieurwissenschaften (Abteilung II)
ethz.date.deposited
2020-10-15T09:37:34Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-10-15T11:33:31Z
ethz.rosetta.lastUpdated
2020-10-15T11:33:31Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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